Clamping device.



F. K. SHAPPER.

GLAMPING DEVICE. APPLICATION FILED MAY 20, 1912.

Patented Nov. 11, 1913.

ram) K. SHAEFER, or SEDALVIA, MISSOURI.

GLAMPING :oEvIcn.

Specification of Letters Patent.

Patented Nov. 1 1, 1913.

v Application filed Ma '2o,1912. Serial No. 698,604.

To all whom it may concern f I Be it known that I, FRED K. SHAFFER, a citizen of the United States, residing at Sedalia, in the county of Pettis andSt-ate of Missouri, have invented'certain new and useful Improvements in Clamping Devices, of which the following is a specification.

This invention relates to clamping devices, and more particularly to certain improvements in such devices which are adapted for securing cylinder heads to the cylinders of gas, and other engines. The invention has other uses" however, and maybe employed equally well in other relations than those specified.

An object of the invention is to provide a simple and efiicient form of bolt which cooperates with a novel form of recess in one of the parts to be clamped. Preferably, the bolt shank extends through the other part and receives a clamping nut which rests upon the member through which the bolt passes and operates in connection with said bolt to draw the parts together in a very simple and effective manner.

The several novel features of the invention and advantages which follow from their use will be made to more fully appear in the following specification.

In the drawings Figure 1 is a horizontal sectional view on the line zv-m of Fig. 2 of an engine cylinder to which my invention is applied; Fig. 2 shows in side elevation portions of a cylinder and cylinder head with the clamping bolt in position thereon; and Fig. 3 is a front elevation of the parts shown in Fig. 2.

The numeral 1 indicates the cylinder of a gas, or other engine having the usual water jacket 3, and the cylinder head 5 which rests upon, and is to be clamped firmly to the cylinder and water jacket. At suitable points in the circumference of the jacket 3 are formed, by casting, milling, or in any other desired manner, pockets or recesses 7 each of which is formed with an inner wall, curved in the arc of a circle and of greatest depth at its center and gradually diminishing in depth to its ends, where they join the outer surface of the water jacket. Centrally of these recesses and in communication therewith are formed upwardly extending recesses 9 whose upper walls are inclined upwardly as shown by dotted lines in cross section in Fig. 2. The bolts 11, which are preferably circular in cross section, have their lower ends upwardly bent and of a form and size to snugly fit within the re-' cesses c flwhen the parts are in finally assembled position. The shanks of the bolts 11 extend through holes in the cylinder head 5,

and the extremities of the bolts project be yond the uppersurface of the head and are threaded te receive the clamping nuts 12. The inner, upturned ends 13 of the bolts 11 present vertical faces slightly curved horizontally to agree with the curvature of the inner walls of recesses 7, said curvesbeing generated from the axial center of the bolt.

To. assemble the parts the shanks of the bolts 11 are passed upwardly through the bores in the cylinder head, and the bent ends I 13 are inserted in the recesses 7 in a position isubstantially parallel with the face of the cylinder. The bolts are then turned, causing the ends 13 to enter the recesses 7 until said ends lie beneath the recesses 9. The bolts are then lifted, the nuts 12 applied to the I threaded outer ends of the bolts and screwed up until the ends 13 are drawn snugly withs in the upper ends of recesses 9. The inclined upper faces of the ends 13 cooperate with the similarly inclined walls of the recesses 9 to draw, with a wedging action, the bolts tightly against the outer face of the cylinder. The cylinder and cylinder head are thus tightly clamped together, and the lower ends of the bolts are locked in clamping position by the engagement of their ends with the vertical recesses 9.

The construction above described provides a very efficient, simple, and easily manipulated clamping bolt for holding the cylinder and cylinder head in assembled relation, and which has the advantage over f0rmer con structions where the bolts pass throughdrilled holes in webs formed within the water jacket in that the holding means in the cylinder for the bolts does not materially obstruct the circulation of the cooling liquid. Another advantage following from the present construction is that the bolts are readily accessible, and if injured or broken may be replaced at very little cost and slight Wall which is curved in the arc of a circle,

said recess gradually diminishing in depth o'liltwardly to one end where it meets the surface of said member, a lock1ngcrecess formed with an undercnt upper yelland icomlnunicating With the curved recess, a second-member, anda bolt passlng'thrcugh said second member and having an up fWardly bent tend tc enter the'loeking' recess and threaded at its otherend-tojreceive a ut:, saidholt hcjng'in axial alinement with ithecenter'pf curvature fthe fiIStflllgl l-t tinned recess 2.; In a, dwice. vro-fr the class descrihed, a?

ing therein: e plurality 7 t enrved recesses end ether recesses cel nndnnicating therewith nd rra ged at an vangle. ti. the. firstnemedi J mess and. p fev d with pwa d y an y, inwardly inclined iiplper "Wa -11s; 2 cylinder J head on vsaid, cylinden' provided with copies? this petent may be obtained for.

al Pl n l o p r ion b l 'he -Z Ling he rlower ends upturn d an p -1 ylded Twit-h upper. inclined snrfe'ees to fit; gthe' inclined wells'pf the seeon d-nemed re-; cesses and their. outerextremitiesjcuryed toj:

fit the curvature of 'the'firs t-nztmedf recesse theshenks ofsaid bolts being adapted to en-f ,te e d'f erfor t es and mi t re t Y the outer ends of said bolts and arranged 'to hziye bearing on the cylinder head to draw the'bent ends o fthe bolts in said vertical recesses, whereby the cylinder and its head are 'fir nily clamped together.

3; A clgnnping device comprising a; member havlng an arc-shaped recess thereln hav- '1'.n g itsgreatestdepth at the center and grad- .mewne tffir t en i ud al 'Wdis ge bent end, om th ecking rec s and. the

a ially. t9 arr aid. d u Q he a csh p d ec s inu clempine s mbers- I testimony w r o I a' i' my gnatur in p sen 9i n i nes s.

" FRED K. SHAEEER Witnesses:

W- E- SQHQWBQRN, 1.1- R EBI fi nt each, 5? ad ress ng h mmi sion r at tent t Washingtom l). 0.? 

